Understanding MongoDB Indexes: Beginner-Level Quiz

MongoDB Indexes Quiz

Welcome to the MongoDB Indexes Quiz! This quiz will test your knowledge of one of MongoDB's most critical aspects: indexing. Indexes are vital in optimizing query performance, ensuring efficient data retrieval, and enabling specialized operations like geospatial queries and text searches. Mastering how MongoDB handles indexes is essential for anyone working with large datasets and performance-sensitive applications.

1 / 20

The ______ index is unique and prevents clients from inserting two documents with the same value for the _id field.

_def

_id

$default

None of the mentioned

2 / 20

Which index type would you use to perform geospatial queries in MongoDB?

GeoJSON Index

Spatial Index

2dsphere Index

3d Index

3 / 20

MongoDB can use the _________ of indexes to fulfill queries.

intersection

projection

union

none of the mentioned

4 / 20

To support ________ based sharding, MongoDB provides a hashed index type.

root

primary

hash

all of the mentioned

5 / 20

Which of the following statements is not correct?

MongoDB defines indexes at the collection level and supports indexes on any field or sub-field of the documents in a MongoDB collection

Fundamentally, indexes in MongoDB is different to indexes in other database systems

MongoDB can return sorted results by using the ordering in the index

None of the above

6 / 20

Which of the following is a valid use case for a hashed index in MongoDB?

Distributing documents evenly across shards in a sharded cluster

Performing text searches

Sorting query results

Optimizing read performance on multikey fields

7 / 20

Which index would you use to ensure that each document in a collection has a unique value for a particular field?

Compound Index

Sparse Index

Multikey Index

Unique Index

8 / 20

The _________ property for an index causes MongoDB to reject duplicate values for the indexed field.

Multikey

Unique

Hashed

None of the mentioned

9 / 20

MongoDB provides a ________ index type that supports searching for string content in a collection.

text

string

char

none of the mentioned

10 / 20

What is a sparse index in MongoDB?

A type of index used to improve write performance

An index that limits the number of indexed documents

An index that stores only partial field values

An index that includes only documents where the indexed field exists

11 / 20

________ index type, which indexes the hash of the value of a field.

Multikey

Hashed

Unique

None of the mentioned

12 / 20

How does MongoDB handle index creation for very large datasets?

Indexes are created only during off-peak hours automatically

Index creation fails for datasets larger than 10GB

MongoDB requires a full database lock during index creation

MongoDB creates indexes in the background to avoid blocking operations

13 / 20

What is the impact of creating too many indexes in MongoDB?

It improves both read and write performance

It disables query caching

It increases storage requirements and slows down write operations

It reduces the size of the data stored

14 / 20

What is the default behavior if no indexes are defined on a collection?

MongoDB performs a full collection scan

MongoDB throws an error during query execution

MongoDB automatically creates an index

The query is denied

15 / 20

Which of the following statements is correct?

The index stores the location of a specific field or set of fields, ordered by the value of the field

Indexes support the efficient execution of queries in MongoDB

If an appropriate index exists for a query, MongoDB cannot use the index to limit the number of documents it must inspect

None of the above

16 / 20

___________ indexes use spherical geometry to return results.

1dsphere

2dsphere

3dsphere

none of the mentioned

17 / 20

Which of the following indexes can be used to search for text-based content within a MongoDB collection?

Multikey Index

Hash Index

Wildcard Index

Text Index

18 / 20

MongoDB uses ______ indexes to index the content stored in arrays.

singlekey

compkey

multikey

none of the mentioned

19 / 20

Which command is used to create an index in MongoDB?

db.collection.setIndex()

db.collection.addIndex()

db.collection.index()

db.collection.createIndex()

20 / 20

What happens if you attempt to insert a duplicate value into a field with a unique index?

MongoDB will throw a duplicate key error

MongoDB will allow the insert without any issues

MongoDB will accept the value but remove the existing document

The new value will overwrite the old one

Your score is

The average score is 0%

MongoDB Indexes focuses on optimizing query performance in MongoDB by creating indexes on fields in a collection. It also explains how indexes speed up data retrieval by reducing the number of documents MongoDB needs to scan.

This quiz is designed for users who are familiar with basic MongoDB operations and want to enhance their knowledge of query optimization.

Best of luck!